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Help :/ find all the roots by factoring or using the quadratic formula.. f(x)=x^4+5x^2+4
 one year ago
 one year ago
Help :/ find all the roots by factoring or using the quadratic formula.. f(x)=x^4+5x^2+4
 one year ago
 one year ago

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AccessDeniedBest ResponseYou've already chosen the best response.1
To find the roots, we set f(x) = 0. \(x^4 + 5x^2 4 = 0\) Now, at first glance, this does not appear to be a quadratic equation. However, what happens if we made a substitution like u = x^2 ?
 one year ago

AccessDeniedBest ResponseYou've already chosen the best response.1
oops, that should say \(x^4 + 5x^2 + 4 = 0\)
 one year ago

AccessDeniedBest ResponseYou've already chosen the best response.1
^ Yep. In this form, it becomes a quadratic equation! So, now we are able to either factor or use quadratic formula with this equation.
 one year ago
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